SpringBoot2学习（三）：原生组件注入

package demo.boot.demo03;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
 
@ServletComponentScan(basePackages = "demo.boot.demo03")
@SpringBootApplication
public class Demo03Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Demo03Application.class, args);
    }
 
}

package demo.boot.demo03.servlet;
 
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
@WebServlet(urlPatterns = "/my")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hahaha");
    }
}

package demo.boot.demo03.servlet;
 
 
import lombok.extern.slf4j.Slf4j;
 
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
 
@Slf4j
@WebFilter(urlPatterns = "/css/*")
public class MyFilter implements Filter {
 
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("MyFilter初始化完成");
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("MyFilter工作");
        filterChain.doFilter(servletRequest,servletResponse);
    }
 
    @Override
    public void destroy() {
        log.info("MyFilter销毁");
    }
}

package demo.boot.demo03.servlet;
 
import lombok.extern.slf4j.Slf4j;
 
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
 
@Slf4j
@WebListener
public class MyServletContextListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        log.info("监听到项目初始化完成");
    }
 
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        log.info("监听到项目销毁");
    }
}

package demo.boot.demo03.servlet;
 
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
import java.util.Arrays;
 
@Configuration(proxyBeanMethods = true)     //保证依赖的组件始终是单实例的
public class MyRegisterConfig {
 
    @Bean
    public ServletRegistrationBean myServlet(){
        MyServlet myServlet = new MyServlet();
 
        //因为底层是urlMapping，所以可以传多个路径
        return new ServletRegistrationBean(myServlet,"/my","/my02");
    }
 
    @Bean
    public FilterRegistrationBean myFilter(){
        MyFilter myFilter = new MyFilter();
        //拦截servlet的路径
//        return new FilterRegistrationBean(myFilter,myServlet());
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/my","/css/*"));
        return filterRegistrationBean;
    }
 
    @Bean
    public ServletListenerRegistrationBean myListener(){
        MyServletContextListener myServletContextListener = new MyServletContextListener();
        return new ServletListenerRegistrationBean(myServletContextListener);
    }
}